[ntp:questions] WiFi & NTP.
oberman at es.net
Thu Aug 30 15:08:22 UTC 2007
> From: "Richard B. Gilbert" <rgilbert88 at comcast.net>
> Date: Thu, 30 Aug 2007 10:45:01 -0400
> Sender: questions-bounces+oberman=es.net at lists.ntp.org
> Maarten Wiltink wrote:
> > "Guy" <gdelavil at ens.insa-rennes.fr> wrote in message
> > news:1188474891.630591.247300 at k79g2000hse.googlegroups.com...
> >>Something important I forgot to mention is that my goal is not to
> >>have the most precise absolute time but to have the smallest offset
> >>as possible on a local network and using a WiFi connection.
> >>So I declared one of my devices as an NTP server and the other as a
> >>client (syncing to a single time source as a matter of fact).
> > The 'problem' with that is that you are then at the mercy of the
> > stability of your server. The stability of the crystal that ultimately
> > drives a local clock reference isn't great, it's quite temperature-
> > dependent.
> > On the other hand, it _is_ quite predictable - people have produced
> > graphs where it is clearly visible when the airconditioning in the
> > server room started up, or when doors and windows were opened.
> > The lesson as I read it is to make sure your server has a stable
> > environment. If the motherboard temperature is constant, so will be
> > the crystal speed. However, you are surrounded here by some rather
> > hardcore geeks, who read the lesson differently as requiring that you
> > have the One True Time, and stability will naturally follow from it.
> > Groetjes,
> > Maarten Wiltink
> Let's hear it for "The One True Time"!
And which time is that? UTC, GMT, TAI, ...?
I hate leap seconds!!!
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
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